There is also no such thing as a standard 'three spaces' definition. Three spaces in what font and at what point size (it's different for every font & point size)?

Moreover, if you're using justification, the 'three spaces' will expand or shrink to accommodate that! Consequently, every paragraph in your document could have a different 'three spaces' interpretation...

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]